PDF malware analysis — malicious · aea947809e4ff5d0

MALICIOUS

PDF

85.9 KB Created: 2021-03-31 08:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: ebdce5494bd3f671f13025d2138041d3 SHA-1: a5d8ca404d2c5d0e732572e7446ce4292a990542 SHA-256: aea947809e4ff5d08839df02bcdf89c4d8eb4ad3f01232a7f1ba98206df1e2aa

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded and invisible links pointing to suspicious domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE

PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://resalured.ru/wix?keyword=ttpod+apk+2019 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4367668/normal_603e46a257ae5.pdfIn PDF document text
- https://cdn.sqhk.co/zenekukera/ijjaWEM/rotinawijudaxumo.pdfIn PDF document text
- http://lorenbayi.com/craftsman_professional_1500_lb_motorcycle_atv_jack_manualcnn3g.pdfIn PDF document text
- http://uplrezina.site/coleman_cpx_6_trifecta_lantern_manual609yq.pdfIn PDF document text
- http://psyhologrzn.ru/birthday_sermon_outline_for_youthyh714.pdfIn PDF document text
- https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/nekemo-zinefe.pdfIn PDF document text
- https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/wifugiwonusiwodowuw.pdfIn PDF document text
- http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469834/normal_60430b94cc104.pdfIn PDF document text
- https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/2848219.pdfIn PDF document text
- https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/mipozafatapiduje.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454422/normal_60216a83769bb.pdfIn PDF document text
- http://scotiaenlineape-personas.com/dabatanelikagoseduxar1hbne.pdfIn PDF document text
- https://cdn.sqhk.co/pemenodisoda/tq4igif/judatepokegowuketa.pdfIn PDF document text
- http://securitycheckingbrowservkcom.xyz/oxford_picture_dictionary_free9zrab.pdfIn PDF document text
- http://talkme-news.info/80929265377hxdq2.pdfIn PDF document text
- http://ledy66.net/largest_college_basketball_arena_capacityt85vn.pdfIn PDF document text
- http://antonioita.fun/was_collier_landry_adopted5pq5r.pdfIn PDF document text
- http://chunyoo.com/mancala_origin_of_wordvlz4k.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366625/normal_5fcdc2c5aa869.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388839/normal_6063982b13561.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eefd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEFD	5144 bytes
SHA-256: `5eb5b67c5a519af0be293db347729416e41cc5cf2dbbaa4ff12a612bdaa21ab6`
`font_01_sfnt_off00010098.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10098	22520 bytes
SHA-256: `b8ff2c6d3f73bedafaaadf430c842a6f2a50e3c6f6a61ef03f0d61173db222c4`
`font_02_sfnt_off000133e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133E7	16132 bytes
SHA-256: `859921f1c7f5c3e429dd92e5907e2417d4f2043afbd4c2fffc8dbcd4c1380f86`

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